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There is mild congestion of her conjunctiva
of her eyes which is causing the redness. Does she get tear secretion from the same eye as well. If there is itching and discharge it could be due to conjunctivitis
especially if decreased vision in that eye which can be dangerous and needs Ophthalmologist consult If she is having only on the side of the headache it may be part of SUNA headache. You need to get her examined by a Neurologist
who will be able to evaluate why she is getting these headaches
and also give proper treatment after taking possible scan as well.